Police and fire vehicles at the scene of the Los Angeles Air Force Base Lockdown in El Segundo. June 17, 2014. (Sean Hiller / Staff Photographer)

A report of a man in camouflage carrying ammunition and wires sticking out of his backpack forced a lockdown at the Los Angeles Air Force Base in El Segundo on Tuesday as police went building to building trying to find him.

Nearly four hours after the incident was first reported, the base sounded an “all clear” over its loudspeakers at about 6:15 p.m. Police found the man in question and discovered he posed no threat. The man was exercising in some type of workout vest that made him appear suspicious, base spokesman Don Traud said.

It wasn’t clear whether the man knew his workout outfit was the reason for the lockdown, Traud said.

It was not known how many people were inside the base during the lockdown, but there are thousands of people at the facility on Douglas Street near Aviation Boulevard every day.

Parents of children in a day-care center on the base, however, were allowed to pick up their children, who were brought out to be reunited with their families during the lockdown. And several nearby streets, including El Segundo and Aviation boulevards, were reopened late in the day.

“This is definitely a safety precaution for our people on base to make sure that everybody is OK,” Traud said earlier in the afternoon. “Nobody is coming on base and nobody is leaving at this time.”

Officials would not describe any other activities regarding the search.

The call came in at 2:30 p.m. as a report of an “active shooter” at the Air Force Base campus, but police quickly discounted that any shots were fired. The search prompted the closures of El Segundo and Aviation boulevards.

Police, however, learned that, about an hour earlier, a man was spotted on the base in camouflage wearing either a backpack or vest that was suspicious to them because someone said it had ammunition and wires sticking out of it, El Segundo police Capt. Brian Evanski said.

Police closed the streets surrounding the base for safety precautions.

By 8 p.m., officials at the base issued a statement saying the facility had reopened and had resumed normal operations.

“The safety and security of our personnel is our top priority. Out of an abundance of caution, the base was placed on lockdown in order to conduct a building-to-building search,” the statement said. “The search is complete and security forces have determined that there was no threat.”